ISBN: 9784893587558Year of publication: 2010Publisher: Bonjinsha Co.LTDNumber of pages: 144 (Main book ) + 16 (answer key)Languages: Japanese, EnglishCountry of origin: Japan
ISBN: 978-4-89358-756-5 // ISBN: 9784893587565Year of publication: 2016Publisher: BonjinshaNumber of pages: 181 (main book) + 28 (booklet with solutions and audio transcripts)Languages: Japanese, English, Chinese, KoreanCountry of origin: Japan